US3522516A - Power supply having incrementally related high voltage outputs - Google Patents

Power supply having incrementally related high voltage outputs Download PDF

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Publication number
US3522516A
US3522516A US735118A US3522516DA US3522516A US 3522516 A US3522516 A US 3522516A US 735118 A US735118 A US 735118A US 3522516D A US3522516D A US 3522516DA US 3522516 A US3522516 A US 3522516A
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United States
Prior art keywords
voltage
terminal
high voltage
power supply
output
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Expired - Lifetime
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US735118A
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English (en)
Inventor
David S Cochran
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HP Inc
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Hewlett Packard Co
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Publication date
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Publication of US3522516A publication Critical patent/US3522516A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode

Definitions

  • a high voltage component such as a cathode ray tube, generally is powered by several high voltages which are closely and critically, related to one another.
  • the control grid of the tube should be biased with a slightly more negative predetermined voltage on the order of -3100 volts.
  • the grid bias voltage is easily and accurately adjustable within a narrow voltage range and is stable with time and temperature.
  • Typical prior art power supplies that provide two incrementally related high voltages employ a power transformer having two secondary windings which drive separate rectifiers and filters. Since both secondary windings must be heavily insulated, the power transformer is generally large and expensive. Also, proper operation is achieved only after carefully equalizing the rectification and filtering attenuation of each circuit. Generally, the output of the bias voltage rectifier and filter is adjusted by a potentiometer.
  • the illustrated embodiment of the present invention includes a power transformer having a single high voltage secondary winding which is tapped to provide a source of low voltage.
  • the high voltage is rectified, filtered and applied to an output terminal.
  • the low voltage from the tap of the secondary winding is adjusted by a voltage divider and then rectified and filtered by a voltage multiplier having a capacitively coupled input.
  • the output of the low voltage source is connected to the high voltage output terminal and provides a small voltage increment which is referenced to the high voltage source.
  • the voltage increment is utilizable as a :bias voltage, for example, and can be accurately adjusted by the voltage divider to any desired value within a broad range. Since the voltage divider operates at low voltages, it requires little insulation from ground potential and is not affected by reasonable variations in humidity and temperature.
  • a high voltage power supply including a power transformer having primary and secondary windings 11, 13, respectively.
  • the secondary winding 13 is tapped at an intermediate terminal point 15 to define upper andlower sections (as viewed in the drawing) having a turns ratio N :N on the order of 50:1.
  • the number of turns N on the primary winding is selected on the basis of the input voltage E and the desiredoutput voltages.
  • E is about 12 volts A.C.
  • the secondary winding outputvoltage is about 6000 volts peak-to-peak.
  • the high voltage appearing across the two end terminals .17, 19 of the. secondary winding 13 is half-wave rectified by a diode 21 and thenfiltered by a network including two capacitors 23, 25 and a resistor 27.
  • Terminal 19 is referenced to ground; and a high negative DC. voltage, on the order of 3000 volts, is obtained from output terminal 29..
  • output terminal 29 is connected to a cathode ray tube 31 and provides the high negative cathode voltage, ---E however, it is to be noted that the power supply circuit described herein may be also used to drive other high voltage components.
  • the output across the tap point terminal 15 and terminal 19 is volts peak-to-peak.
  • This low voltage is adjustable within a predetermined range by a potentiometer 33 which is connected in a voltage divider configuration with a resistor 35.
  • the movable arm of potentiometer 33 is connected to a low voltage D.C. supply 37, which is a peak-to-peak voltage rectifier or multiplier having an input terminal 39 and positive and negative output terminals 41, 43, respectively.
  • the output terminal 41 is connected directly to the output terminal 29 of the high voltage power supply'. Coupled in parallel between the low voltage terminals 41, 43 are a load resistor 45, a capacitor 47 and two series connected diodes 49, 51.
  • the common junction of diodes 49, 51 is A.C. coupled to the low voltage input terminal 39 through a capacitor 53.
  • capacitor 53 is charged through diode 49 and the filtering network of the high voltage power supply during the positive halfcycle of the low voltage input to terminal 39 Ge. when tap point terminal 15 is more positive than terminal 19).
  • capacitor 47 is charged by current flowing through capacitor 53, diode 51 and the high voltage power supply.
  • the capacitor 47 is charged to a voltage equal to the sum of the positive peak voltage across capacitor 53 and the negative peak voltage input to terminal 39.
  • diodes 49, 51 conduct on alternate one-half cycles to charge capacitors 53, 47, respectively, and the total DC. voltage across terminals 41, 43 is the peak-to-peak value of the AC. voltage input to terminal 39.
  • Load resistor 45 functions to discharge capacitor 47 when the transformer input voltage E is disconnected.
  • the output voltage of the low voltage D.C. supply 37 is referenced to the high negative DC. voltage at terminal 29 by the aforementioned connection between terminal 29 and terminal 41. Therefore the negative output voltage from terminal 43 will be related to the negative voltage from terminal 29 by a small voltage increment which can be easily adjusted by potentiometer 33.
  • the negative D.C. output voltage from terminal 43 is used to provide the grid bias voltage E for cathode ray tube 31.
  • a circuit for producing two high voltage outputs related to one another by an incremental value comprising:
  • a transformer having primary and secondary windings, said secondary winding having two end terminals and an intermediate tap at a predetermined low voltage point near one of said end terminals; and rectifying and filtering means connected to the end terminals of said secondary winding, said rectifying and filtering means having a high voltage output terminal connectable to a load; means providing a source of low D.C. voltage having a magnitude less than the voltage at said high voltage output terminal, said low D.C. voltage source means having a capacitively coupled input terminal, and two opposite polarity output terminals; means connecting the input terminal of said low D.C. voltage source means to the intermediate tap of said secondary winding; and
  • said low D.C. voltage source means comprises voltage multiplier means including:
  • said voltage multiplier further including load resistor means connected in parallel with said first capacitor.
  • said means connecting the input terminal of said low D.C. voltage source means to the intermediate tap of said secondary winding including: adjustable voltage divider means interconnecting said intermediate tap and said nearest one end terminal of said secondary winding.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Rectifiers (AREA)
US735118A 1968-06-06 1968-06-06 Power supply having incrementally related high voltage outputs Expired - Lifetime US3522516A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73511868A 1968-06-06 1968-06-06

Publications (1)

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US3522516A true US3522516A (en) 1970-08-04

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US735118A Expired - Lifetime US3522516A (en) 1968-06-06 1968-06-06 Power supply having incrementally related high voltage outputs

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US (1) US3522516A (enrdf_load_stackoverflow)
JP (1) JPS4818733B1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51141832U (enrdf_load_stackoverflow) * 1975-05-10 1976-11-15

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744229A (en) * 1943-12-20 1956-05-01 Bell Telephone Labor Inc Power supply system
US2785336A (en) * 1954-06-09 1957-03-12 Rca Corp Regulated high voltage supplies
US3132309A (en) * 1958-10-31 1964-05-05 Electronic Products Company Battery operated power supply

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744229A (en) * 1943-12-20 1956-05-01 Bell Telephone Labor Inc Power supply system
US2785336A (en) * 1954-06-09 1957-03-12 Rca Corp Regulated high voltage supplies
US3132309A (en) * 1958-10-31 1964-05-05 Electronic Products Company Battery operated power supply

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Publication number Publication date
JPS4818733B1 (enrdf_load_stackoverflow) 1973-06-08

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